You might consider trying to firmly attach the Pokéwalker to a fan and then turning both devices on.
Chat with our AI personalities
Since there are no codes for Heart Gold yet, I know a little secret...... You know when you put a Pokemon on the Pokewalker, if saves afterward. Well, while its saving turn off the power. Now you have two of that pokemon. One in your PC box and one on the pokewalker. :-)
dont feed it and it will just run away.
By unlocking the pokewalker route
yes
You can't put a Pokemon in the pokewalker in Pokemon platinum, as the pokewalker was designed for only Pokemon Heartgold & Soulsilver.